Fire detector



FIG. 1 is a perspective view of the front, and bottom of a fire detector showing my (our) new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a right side view thereof; and,

FIG. 7 is a left side view thereof.

The broken lines disclosed in FIG. 3 depict environmental subject matter that forms no part of the claimed design. 

The ornamental design for a fire detector, as shown and described. 